NOAA forecasts below-normal 2026 Atlantic hurricane season as developing El Niño suppresses storm formation
The May 21 outlook gives a 55% chance of a below-normal season with 8-14 named storms and 3-6 hurricanes; Tropical Storm Arthur, the first named system, made landfall near Galveston in June with US$100m in damages
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Summary
NOAA announced on May 21, 2026 that the Atlantic hurricane season was forecast to be below normal, giving a 55% probability of fewer storms than average, 35% near-normal, and 10% above-normal. The outlook projects 8-14 named storms, 3-6 hurricanes, and 1-3 major hurricanes. The primary driver is a developing El Niño event expected to strengthen through summer and autumn, which raises vertical wind shear over the Atlantic and disrupts the organised convection that allows tropical cyclones to form and intensify. The season opened with Tropical Storm Arthur, the first named system, which formed in the Gulf of Mexico on June 17, made landfall near Galveston, Texas as a minimal storm with 40-knot winds, and then produced extreme rainfall across Louisiana, setting a preliminary state record of 29.06 inches in under 12 hours near Cottonport. Aon estimated damages above US$100 million and at least four people were killed.
The split
US meteorological media treated the NOAA forecast as a clear El Niño signal and stressed the below-normal implication for Gulf of Mexico and East Coast states. University-based seasonal forecasters, particularly Colorado State University, were cautiously aligned with NOAA. The University of Arizona's outlier forecast of 20 named storms attracted attention precisely because it diverged so sharply. Caribbean and Central American media gave the forecast lighter treatment, noting that their exposure depends not on seasonal totals but on track geography, an El Niño season can still send one major hurricane directly at Belize or Haiti.
By the numbers
- 55%, NOAA probability of a below-normal 2026 season
- 8-14, named storms forecast by NOAA
- 3-6, hurricanes in NOAA's 2026 range
- 1-3, major (Category 3+) hurricanes forecast
- 40 knots, Tropical Storm Arthur's peak intensity at Galveston landfall
- 29.06 inches, preliminary Louisiana state rainfall record (24h) set by Arthur's remnants near Cottonport
- US$100m+, estimated damage from Tropical Storm Arthur (Aon)
- 4, confirmed deaths from Tropical Storm Arthur
Why it matters
El Niño's suppressive effect on Atlantic hurricane activity is one of the more robust seasonal forecast relationships in tropical meteorology, but it operates probabilistically, not deterministically. Below-normal seasons have still produced catastrophic storms (Hurricane Andrew in 1992, for example, occurred in a below-normal year). The United States Gulf Coast and Caribbean island economies remain structurally exposed regardless of seasonal totals, and US$100 million in damage from the season's first minimal storm illustrates how the interaction between storm intensity and vulnerable coastal infrastructure matters more than the named-storm count.
What to watch
- Whether El Niño strengthens as forecast through the peak August-October season window.
- Any system that organises in the Main Development Region between West Africa and the Caribbean, which is the origin area for the most intense Atlantic hurricanes.
- Whether the below-normal total is revised by NOAA at its August mid-season update.
- Louisiana and Texas recovery from Arthur's flooding as the season continues.